// license:BSD-3-Clause // copyright-holders:hap /* National Semiconductor COPS(MM57 MCU family) disassembler */ #include "emu.h" #include "cops1d.h" // constructor cops1_common_disassembler::cops1_common_disassembler() { // init lfsr pc lut for (u32 i = 0, pc = 0; i < 0x40; i++) { m_l2r[i] = pc; m_r2l[pc] = i; pc = increment_pc(pc); } } offs_t cops1_common_disassembler::increment_pc(offs_t pc) { int feed = ((pc & 0x3e) == 0) ? 1 : 0; feed ^= (pc >> 1 ^ pc) & 1; return (pc & ~0x3f) | (pc >> 1 & 0x1f) | (feed << 5); } // common lookup tables enum cops1_common_disassembler::e_mnemonics : unsigned { mILL, mAD, mADD, mSUB, mCOMP, m0TA, mADX, mHXA, mTAM, mSC, mRSC, mTC, mTIN, mTF, mTKB, mTIR, mBTD, mDSPA, mDSPS, mAXO, mLDF, mREAD, mGO, mCALL, mRET, mRETS, mLG, mLGCALL, mNOP, mEXC, mEXCM, mEXCP, mMTA, mLM, mSM1, mSM2, mSM4, mSM8, mRSM1, mRSM2, mRSM4, mRSM8, mTM, mLB, mLBL, mATB, mBTA, mHXBR }; const char *const cops1_common_disassembler::s_name[] = { "?", "AD", "ADD", "SUB", "COMP", "0TA", "ADX", "HXA", "TAM", "SC", "RSC", "TC", "TIN", "TF", "TKB", "TIR", "BTD", "DSPA", "DSPS", "AXO", "LDF", "READ", "GO", "CALL", "RET", "RETS", "LG/GO", "LG/CALL", "NOP", "EXC", "EXCM", "EXCP", "MTA", "LM", "SM", "SM", "SM", "SM", "RSM", "RSM", "RSM", "RSM", "TM", "LB", "LBL", "ATB", "BTA", "HXBR" }; // bitmask for opcode parameter const u8 cops1_common_disassembler::s_bits[] = { 0, 0, 0, 0, 0, 0, 0x0f, 0, 0, 0, 0, 0, 0, 0x30, 0, 0, 0, 0, 0, 0, 0xff, 0, 0x3f, 0x3f, 0, 0, 0xff, 0xff, 0, 0x30, 0x30, 0x30, 0x30, 0x0f, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x3f, 0xff, 0, 0, 0 }; const u32 cops1_common_disassembler::s_flags[] = { 0, 0, STEP_COND, STEP_COND, 0, 0, STEP_COND, 0, STEP_COND, 0, 0, STEP_COND, STEP_COND, STEP_COND, STEP_COND, STEP_COND, 0, 0, 0, 0, 0, 0, 0, STEP_OVER, STEP_OUT, STEP_OUT, 0, STEP_OVER, 0, 0, STEP_COND, STEP_COND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // common disasm offs_t cops1_common_disassembler::common_disasm(const u8 *lut_opmap, std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) { // get raw opcode u8 op = opcodes.r8(pc); u8 instr = lut_opmap[op]; int len = 1; // get parameter u8 mask = s_bits[instr]; u16 param = op & mask; if (mask == 0x30) { mask >>= 4; param >>= 4; } // 2-byte instructions else if (mask == 0xff) { pc = increment_pc(pc); u8 arg = params.r8(pc); len++; if (instr == mLG) { // bit 6 indicates GO or CALL if (~arg & 0x40) instr++; param = (~param << 7 & 0x780) | (arg >> 1 & 0x40) | (arg & 0x3f); } else param = arg; } // disassemble it util::stream_format(stream, "%-8s", s_name[instr]); if (mask > 0) { if (mask < 16) { // SM and RSM param is scrambled if (instr >= mSM1 && instr <= mSM8) param = instr - mSM1; else if (instr >= mRSM1 && instr <= mRSM8) param = instr - mRSM1; // memory bit opcodes are 1,2,4,8 if (instr >= mSM1 && instr <= mTM) param = 1 << param; // TF is 1,2,3,4 else if (instr == mTF) param++; // EXC type instructions omit param if it's 0 if (!(param == 0 && (instr == mEXC || instr == mEXCM || instr == mEXCP || instr == mMTA))) util::stream_format(stream, "%d", param); } else { // exception for LG if (instr == mLG || instr == mLGCALL) util::stream_format(stream, "$%02X,$%02X", param >> 6, param & 0x3f); // exception for LB/LBL else if (instr == mLB || instr == mLBL) { // LB x,10 is 0 by default if (instr == mLB && (param & 0xf) == 10) param &= 0x30; util::stream_format(stream, "%d,%d", param >> 4, param & 0xf); } else util::stream_format(stream, "$%02X", param); } } return len | s_flags[instr] | SUPPORTED; } // MM5799 disasm const u8 mm5799_disassembler::mm5799_opmap[0x100] = { // 0 1 2 3 4 5 6 7 8 9 A B C D E F mNOP, mHXBR, mADD, mSC, mTF, mTIR, mMTA, mEXC, mEXCM, mEXCP, mLB, mLB, mLB, mLB, mLB, mLB, // 0 mDSPA, mDSPS, mAD, mLBL, mTF, mTKB, mMTA, mEXC, mEXCM, mEXCP, mLB, mLB, mLB, mLB, mLB, mLB, // 1 mCOMP, mAXO, mSUB, mRSC, mTF, mBTD, mMTA, mEXC, mEXCM, mEXCP, mLB, mLB, mLB, mLB, mLB, mLB, // 2 m0TA, mHXA, mTAM, mLDF, mREAD, mTIN, mMTA, mEXC, mEXCM, mEXCP, mLB, mLB, mLB, mLB, mLB, mLB, // 3 mRET, mRETS, mRSM8, mBTA, mTM, mTM, mTM, mTM, mRSM1, mSM1, mSM8, mRSM4, mRSM2, mTC, mSM2, mSM4, // 4 mATB, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, mADX, // 5 mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, mLG, // 6 mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, mLM, // 7 mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, // 8 mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, // 9 mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, // A mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, mCALL, // B mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, // C mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, // D mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, // E mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO, mGO // F }; offs_t mm5799_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) { return common_disasm(mm5799_opmap, stream, pc, opcodes, params); }